2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

SKU: 17221
Part Number: 2-CH RS485 HAT
Brand: Waveshare


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2-Channel Isolated RS485 Expansion HAT For Raspberry Pi, SC16IS752+SP3485 Solution, With Multi Onboard Protection Circuits
2-channel isolated RS485 HAT for Raspberry Pi

2-Ch RS485, SPI communication

Bulit-in power supply isolation, magnetical isolation, and TVS diode, etc.

Features at a glance

This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, magnetical isolation, and TVS diode, etc.
It is easy to control the 2-channel RS485 for auto transceiving via SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.

  • Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
  • Adopts SC16IS752+SP3485 dual chip combination, converts SPI to RS485, data rate up to 921600bps
  • Allows transceiving data manually or automatically, configured by DIP switch
  • Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic
  • Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, and improves shock proof performance
  • Onboard LEDs for indicating the power and transceiver status
  • Breakout SPI control pins, for connecting with host control boards like Arduino
  • Comes with online development resources and manual (examples in C and Python)
UART expansion chip SC16IS752
RS485 transceiver SP3485
Communication interface SPI
Data rate 300 ~ 921600 bps
Operating voltage 3.3V / 5V
Dimensions 65.0 × 56.5mm
Mounting hole size 3.0mm

Connect to Raspberry Pi series boards

Standard Raspberry Pi 40PIN GPIO Header, Customized For Raspberry Pi Series Boards

What's On Board
  1. SC16IS752
    UART expansion chip
  2. π142M61
    digital isolator
  3. PC817
  4. SP3485
    RS485 transceiver
  5. B0505LS
    power supply isolation module
  6. RT9193-33
    power chip
  7. SMAJ12CA
    transient suppress diode array
  8. Resettable fuse
  1. Status indicator
    PWR: power indicator
    RXD/TXD: UART transceiving indicator
  2. Raspberry Pi GPIO header
    for connecting Raspberry Pi
  3. RS485 terminal
  4. MCU control header
    for connecting host control boards like Arduino
  5. 120Ω terminal resistor switch
  6. Interrupt pin switch
  7. Operating mode selection
    Half-auto: A=0, B=1
    Full-auto: A=1, B=0
Pin Definition
Product show

Outline dimensions
Resources & Services

* Resources for different product may vary, please check the wiki page to confirm the actually provided resources.

Weight: 0.029 kg

Quick Overview

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